feat: validate org domains (#3387)

* feat: validate org domain command side

* feat: validate org domain query side

* fix: create domain policy

* feat: add reading domain policy on addorg domain

internal/domain/policy_domain.go

@@ -0,0 +1,13 @@
+package domain
+
+import (
+	"github.com/caos/zitadel/internal/eventstore/v1/models"
+)
+
+type DomainPolicy struct {
+	models.ObjectRoot
+
+	UserLoginMustBeDomain bool
+	ValidateOrgDomains    bool
+	Default               bool
+}